HUB 9S2937 - Caterpillar

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
This Program must be administered as soon as possible. When reporting the repair, use "PI3013" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3013" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
Completion Date
January 31, 1997Termination Date
July 31, 1998Problem
Line relief valves may not work correctly on certain 325B L, 325B LN, 330B L and 330B LN Excavators. The valve may open at a too high pressure even if it has been correctly set within specifications. A new valve group needs to be installed.
Affected Product
Model & Identification Number
325B L (6DN309-320, 6DN322-335, 6DN338-340, 6DN342, 6DN346-347, 6DN350)
325B LN (8FN248-249, 8FN251, 8FN254-280, 8FN282, 8FN284)
330B L (3YR208-210, 3YR212-225, 3YR227-234, 3YR236-237, 3YR239, 3YR241-243, 3YR245, 3YR247, 3YR249)
330B LN (5LR178-203, 5LR205)
Parts Needed
4 - 1163600 Valve Group - Relief The number of 1163600 Valve Groups needed depends on the machine configuration. See the attached Rework Procedure for details.
Action Required
See the attached Rework Procedure.
Owner Notification
U.S. and Canadian owners will receive the attached Owner Notification.
Service Claim Allowances
This is a 2-hour job
U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach.(1-Owner Notification)(2-Rework Procedure)Copy Of Owner Notification For U.S. And Canadian Owners
Rework Procedure
1. Position the machine on level ground, attach a vacuum to the hydraulic tank be prepared to catch hydraulic oil spills that may occur.2. Replace the line relief valves of the boom cylinder rod end, bucket cylinder head end, bucket cylinder rod end, stick cylinder head end, stick cylinder rod end, auxiliary circuit (if equipped), with new ones.3. Adjust the new line relief valves refer to the Testing and Adjusting section of the SENR1655 or SENR9280 Service Manual. See Illustration 1. If the machine is equipped with the stick lowering check valve arrangement, the stick cylinder rod end line relief valve is part of the stick lowering check valve and there is no need to replace it (machines in Groups B and D).
The number of 1163600 Valve Groups needed depends on the machine configuration. See the chart below:
Group A - 7 relief valves need to be replacedGroup B - 6 relief valves need to be replacedGroup C - 5 relief valves need to be replacedGroup D - 4 relief valves need to be replaced Group A
325B (6DN315-318, 8FN269-270, 272, 274-276, 279, 284)
330 B (3YR215, 228, 245)
Group B
325B (6DN311-312)
330B (3YR216)
Group C
325B (6DN310, 313-314, 319-320, 322-330, 333, 335, 338-340, 342, 347, 8FN248-249, 251, 254-257, 259-268, 271, 273, 277-278, 280, 282)
330B (3YR208-210, 212-214, 217-220, 222-225, 227, 229-234,